Automotive Grade
AUIR33401S
PROTECTED HIGH SIDE SWITCH
FOR AUTOMOTIVE DC MOTOR DRIVE
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
Up to 20Khz PWM switching capability
Charge pump for DC operation
Active Dv/Dt control
Load current feedback
Short-circuit protection
Programmable over current shutdown
Over temperature shutdown
Under voltage shutdown
Gnd, IN and bootstrap pin loss protection
E.S.D protection
Low power mode
Leadfree, RoHS compliant
Automotive qualified*
Product Summary
Rds(on)@25°C
3.5m
Ω
max.
Max current
33A
Operating voltage 6 – 18V
Application
•
•
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Fan engine cooling
Air conditioning blower
Pumps (oil, fuel, water…)
Compressor
Package
Description
The AUIR33401S is a 7 terminals high side switch for variable
speed DC motor. It features simplify the design of the DC
motor drive with a microcontroller. The Mosfet switches the
power load proportionally to the input signal duty cycle at the
same frequency and provides a current feedback on the Ifbk
pin. The over-current shutdown is programmable from 10A to
33A. Over-current and over-temperature latch OFF the power
switch, providing a digital diagnostic status on the input pin. In
sleep mode, the device consumes less than 10uA.
Further integrated protections such as ESD, GND and Cboot
disconnect protection guarantee safe operation in harsh
conditions of the automotive environment.
D2Pak - 7 leads
1
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© 2011 International Rectifier
March 5, 2013
AUIR33401S
Qualification Information
Qualification Level
†
Automotive
††
(per AEC-Q100 )
Comments: This family of ICs has passed an Automotive qualification. IR’s
Industrial and Consumer qualification level is granted by extension of the
higher Automotive level.
7L-DDPAK
MSL1, 260°C
(per IPC/JEDEC J-STD-020)
Class M3
(per AEC-Q-100-003)
Class H2
(per AEC-Q-100-002)
Class C5
(per AEC-Q-100-011)
Moisture Sensitivity Level
Machine Model
ESD
Human Body Model
Charged Device Model
RoHS Compliant
Yes
† Qualification standards can be found at International Rectifier’s web site
http://www.irf.com/
†† Exceptions to AEC-Q100 requirements are noted in the qualification report.
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© 2011 International Rectifier
March 5, 2013
AUIR33401S
Design: basic schematic with micro-processor
The basic circuit is giving all the functionality to drive a motor up to 33A DC. R
Ifbk
set both the level current shutdown and
the current feedback reading scale. The IN signal provides to the AUIR33401S the Pwm duty cycle. D1 is the free
wheeling diode during PWM operation. As the equivalent circuit between Vbat and – Mot is 2 diode in series (the body
diode of the AUIR33401S and D1), the system requires T1, D2, R1 and R2 to sustain the reverse battery.
Recommended connection with reverse battery protection
1
:
+Bat
C3
C4
C1
100nF
Micro-processor
I/O
I/O
IN
Diag
R
IN
R
pdiag
IN
AUIR33401S
A/D
Ifbk
R
pIfbk
C2
1nF
Ifbk
Gnd
Output
D1
MBR
3045CT
T1
IRF140
D2
12V
R2
10k
- Mot
GND
Vcc
CBoot
Cboot
100nF
Vbat
+ Mot
Gnd
Current shutdown
programming resistor
R
Ifbk
Gnd
Figure 1: Recommended schematic
This is the recommended schematic with an optional reverse battery
1
. The recommended load is an inductive load. This
part may not be suitable for application conditions other than those specified above. Please contact IR’s Automotive
Technical support for further details on other applications requirement.
DC to 20 kHz operation
The AUIR33401S is able to operate in DC and high speed switching operation. To be able to switch at 20 kHz, a
bootstrap capacitor is used externally. The device integrates the power supply of the bootstrap capacitor. In DC operation,
when the capacitor is discharged, the charge pump maintains the device ON.
1
The reverse battery is optional. Remove T1, D2, R2 and connect –Mot to Gnd to remove the features.
3
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© 2011 International Rectifier
March 5, 2013
AUIR33401S
Active dv/dt control to reduce EMI Typical Connection
The AUIR33401S includes a special gate drive, managing the Mosfet dv/dt controlled internally, by managing the gate
voltage dynamically. To have the best compromise between the EMI levels and power loss, during the turn on and off
phase, the dv/dt output is dv/dt is not linear. The output voltage shape is an “S” shape.
Sense Load current feedback and programmable current shutdown
The Ifbk pin allows an analog measurement of the load current and with an external resistor allows to program the over
current shutdown level from 10A to 33A. The voltage threshold level of the Ifbk pin is internally set to 4V (See the formulas
below). It is also possible to dynamically adjust the current shutdown protection versus time by adding some external
components. This protection is latched. The operating mode is recovered after resetting by the sleep mode.
Rifbk
=
Vifbk
−
gnd min
×
Ratio min
Imax appli
+
Offset
Ishtd max
=
Vifbk
−
gnd max
×
Ratio max
+
Offset
Rifbk calculated
Where:
Imax appli is the maximum application current
Ishtd max is the maximum output shutdown current
Internal over current shutdown
The maximum current shutdown threshold value is internally fixed to 50A typ. This protection is latched. The operating
mode is recovered after resetting by the sleep mode.
Under voltage lock-out
The AUIR33401S remains operational from UV Lo threshold. Under this continuous voltage, the device will be locked until
the voltage recovers the operating range, according to an internal hysteresis fixed to 0,5V min. The maximum rating
voltage is given by the Trench VDMOS technology where the avalanche voltage is up to 43V typically.
Sleep mode and reset fault:
The sleep mode is enabled if the IN pin stay low (Vin < V
in µpower
) more than Tslp time. The consumption in sleep mode is
Icc off. The AUIR33401S wakes up at first rise edge on the IN pin (Vin > V
in µpower
). This mode allows resetting all the
latched faults. (Cf. Figure 2: Wake sequence, sleep mode and reset latched fault.)
Wake up sequence:
The AUIR33401S has a power on reset. After wake up it by the IN signal, the devices wait for T
pwr_on_rst
before activate the
output power mosfet. This time is necessary to charge properly the bootstrap capacitor and to stabilize the internal power
supply. (Cf. Figure 2: Wake sequence, sleep mode and reset latched fault.)
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© 2011 International Rectifier
March 5, 2013
AUIR33401S
In pin and digital diagnostic
The IN has two functions. In normal working condition, the output follows the IN pin digital level. In latched fault condition
(over current and over temperature shutdown), the IN pin provides a digital frequency signal feedback to the µ-processor.
Fault
Reset
fault
T
slp
Vpwm
T
pwron_rst
5v
≈
≈
≈
≈
Input pin
Diag
5v
1
1
×
2
F
Diag
≈
Vout
Vcc
≈
Figure 2: Wake sequence, sleep mode and reset latched fault.
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© 2011 International Rectifier
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